Stripper unit

ABSTRACT

A stripper unit that includes an unround cylindrical pressure plate, wherein the outer contour of the unround cylinder shape in a cross section transversely through the pressure plate defines the installation space thereof transversely to the direction of extent of the cylinder. A stripper plate is also provided, placed on the end face of the pressure plate and mounted on spring elements such that it can be moved up and down with respect to the pressure plate, wherein the stripper plate is formed geometrically in such a way that it fits completely flush within the outer contour of the cylinder shape of the pressure plate and does not protrude beyond it.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a 35 U.S.C. § 371 national phase application ofInternational Application No.: PCT/EP2020/067282, filed Jun. 22, 2020,which claims the benefit of priority under 35 U.S.C. § 119 to GermanPatent Application No.: 20 2019 106 189.8, filed Nov. 7, 2019, thecontents of which are incorporated herein by reference in theirentirety.

FIELD

The invention relates to a stripper with a particularly compactconstruction.

BACKGROUND

The statements in this section merely provide background informationrelated to the present disclosure and several definitions for terms usedin the present disclosure and may not constitute prior art.

A variety of embodiments of mechanical strippers for punch retainingplates are known, such as, appropriate solutions for standard punchretaining plates according to automotive standard of the working group(BAK/NAAMS) for Ball Lock, heavy and light load, as well as for shoulderpunches.

The strippers are typically guided precisely in a housing on theshoulder and on the outer diameter over the entire stroke. Some of thesolutions have a stripper housing, precision-drilled and rolled smoothlyon the inside, to effect good sliding and supporting forces.

The housing can be made of stable, pre-cured steel and provided withcorrosion protection. Critical active areas can be manipulated withprecision, so that best angularity and alignment is obtained, so thateven upon exposure to side thrusts a long service life is achieved.

However, it is desirable to reduce the structure and thus the outerdimensions and optimize the required installation space.

WO 2007018695A3 discloses a stripper unit which contains a precisionthreaded plug that preloads a mechanical die spring, which, in turn,preloads the movable or moving stripper adjacent the punch tip. Theprecision threaded plug simultaneously accurately positions the stripperunit on a commercially available ball-lock punch retainer. The stripperunit is entirely self-contained on the face of the ball-lock retainer,thus minimizing the space required on the pressure plate.

A disadvantage of the known embodiments is the fact that the stripperunit protrudes from the punch retaining plate, which requires additionalinstallation space and in less than optimal force distribution.

SUMMARY

The present disclosure is therefore based on the object of providing astripper in which the installation space is optimized. This object isachieved by a stripper unit, comprising an unround cylindrical pressureplate, wherein the outer contour of the unround cylinder shape in across section transversely through the pressure plate defines theinstallation space thereof transversely to the direction of extent ofthe cylinder, and a stripper plate is provided, placed on the end faceof the pressure plate and mounted on spring elements such that it can bemoved up and down with respect to the pressure plate, wherein thestripper plate is formed geometrically in such a way that it fitscompletely flush within the outer contour of the cylinder shape of thepressure plate and does not protrude beyond it.

Further areas of applicability will become apparent from the descriptionprovided herein. It should be understood that the description andspecific examples are intended for purposes of illustration only and arenot intended to limit the scope of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

In order that the disclosure may be well understood, there will now bedescribed various forms thereof, given by way of example, referencebeing made to the accompanying drawings, in which:

FIG. 1 shows a plan view of a disadvantageous solution from the priorart;

FIG. 2 shows an isometric view of an exemplary embodiment of a stripperunit according to the teachings of the present disclosure;

FIG. 3 shows a sectional view through FIG. 2;

FIG. 4 shows a plan view on FIG. 2;

FIG. 5 shows an isometric view of a pressure plate;

FIG. 6 shows an isometric view of a stripper plate; and

FIG. 7 shows an isometric view of a stripper socket.

In the following, the invention will be explained in more detail withreference to FIGS. 1 to 7, wherein like reference numerals in thefigures indicate the same structural and/or functional features.

DETAILED DESCRIPTION

The following description is merely exemplary in nature and is in no wayintended to limit the present disclosure or its application or uses. Itshould be understood that throughout the description, correspondingreference numerals indicate like or corresponding parts and features.

According to one aspect of the present disclosure, an unroundcylindrical pressure plate is provided, wherein the outer contour of theunround cylinder shape, in a cross section transversely through thepressure plate, defines the installation space thereof transversely tothe direction of extent of the cylinder, and a stripper plate isprovided, placed on the end face of the pressure plate and mounted onspring elements such that it can be moved up and down with respect tothe pressure plate, wherein the stripper plate is formed geometricallyin such a way that it fits completely flush within the outer contour ofthe cylinder shape of the pressure plate and does not protrude beyondit.

According to another aspect of the present disclosure, it is providedthat further a punch retaining plate is provided, on which the stripperunit is installed, and the stripper plate and the punch retaining plateare geometrically arranged to each other and formed in such a way, thatthe stripper plate, in the installed state, fits completely flush withinthe outer contour of the cylinder shape of the punch retaining plate anddoes not protrude beyond it.

One advantageous solution of the present disclosure is when the stripperplate has the same cross section as the pressure plate and, furtheradvantageous, as the punch plate for mounting in the tool.

According to yet another aspect of the present disclosure, it isprovided that the stripper plate has a cylindrical recess into which astripper socket is inserted, wherein the socket preferably, on one side,has an open receptacle for a punch, for example.

It also may be advantageous if the stripper plate at an end face forms astepped end face thereby dividing the end face by a step separated intotwo partial surfaces which are in different planes.

Another aspect of the present disclosure provides that the recess forthe stripper socket is arranged in the first partial surface opposite towhich the second partial surface protrudes in the direction of extent ofthe cylinder.

A further likewise aspect of the present disclosure provides that thetop of the stripper socket is in a common plane together with the top ofthe second partial surface, or is set back relative to the plane definedby the second partial surface.

One design of the present disclosure provides that the stripper sockethas a head plate formed with a collar, which head plate is formed on oneside with a linearly extending side edge surface which abuts against acorresponding side edge surface on the stripper plate.

Also favorable is a configuration in which the corresponding side edgesurface is formed on the stripper plate by the step.

The present disclosure may also include an implementation in which thestripper plate has a part-circular cross section in the area of thefirst partial surface, which merges at the end of the part-circularcross section to a linear course, in each case, and this linear coursepreferably extends symmetrically to the cylinder extension axis almostup to the step, in each case.

Similarly, another solution for the optimization of installation space,it is further provided that the stripper plate has a part-circular crosssection in the area of the second partial surface and has the same crosssection as the pressure plate.

Furthermore, it may be advantageous if the stripper socket has a headplate formed with a collar, which head plate is formed with apart-circular side edge surface which is flush against the side surfaceof the stripper plate or is set back relative to the same.

Further, it may be desirable if the stripper plate has a symmetricalcross section in the area of the second partial surface, which crosssection is bounded on one side edge by the step and bounded by twopart-circular sections, respectively, which are interconnected by alinear intermediate area.

It is likewise of advantage, when the printing plate and the stripperplate in the installed state each have a flush centering opening intowhich a guide pin is inserted, wherein the guide pin preferably has athread at its one end face, which protrudes from the lower plane of thepressure plate.

To better illustrate the disadvantages of the prior art, FIG. 1illustrates a non-installation-space-optimized solution, in which thestripper protrudes beyond the pressure plate or the punch retainingplate.

FIG. 2 illustrates an isometric view of a stripper unit 1 formedaccording to the teachings of the present disclosure, and FIG. 3illustrates a sectional view and FIG. 4 illustrates a top view thereof.

The stripper unit 1 has an unround cylindrical pressure plate 10, asshown in detail in FIG. 4. The outer contour is clearly visible in theview of FIG. 3 that shows a cross section transversely through thepressure plate 10 and the installation space thereof is definedtransversely to the direction of extent of the cylinder.

Furthermore, the stripper unit 1 has a stripper plate 20 which isinstalled on the end face of the pressure plate 10 to define a distanceand mounted on spring elements 40 such that it can be moved up and downwith respect to the pressure plate 10.

The stripper plate 20 is formed geometrically in such a way that it fitscompletely flush within the outer contour of the cylinder shape of thepressure plate 10 and does not protrude beyond it as in the example ofFIG. 1. Such a flush contour is achieved in that the spring elements 40such as, for example, a compression spring or elastomeric spring is notarranged within the socket contour of the stripper socket 30. Thisdecoupling offers the advantage that the stripper socket 30 is alsolocated entirely within the contour of the stripper plate 20 and thestripper unit 1.

Also not shown is a punch retaining plate, on which the stripper unit 1is or may be installed, and the stripper plate 20 and the punchretaining plate are geometrically also arranged to each other and formedin such a way, that the stripper plate 20 in the installed state fitscompletely flush within the outer contour of the cylinder shape of thepunch retaining plate and does not protrude beyond it.

As already explained, for this purpose the spring elements (e.g.,compression springs 40) are arranged in the stripper plate 20 adjacentto the stripper socket 30 and are thus separated from them.

The stripper plate 20 has a cylindrical recess into which the strippersocket 30 (shown in detail in FIG. 6) is inserted. The stripper socket30 has an annular circumferential groove 35 into which a retaining ring37 engages in order to fix the stripper socket 30 at the stripper plate20.

At the end face pointing upwards in the figure, the stripper plate 20has a stepped end face 21, wherein the end face 21 is divided by a step21 separated into two partial surfaces 21 a, 21 b which thereby are indifferent planes. Said recess 25 for the stripper socket 30 is arrangedhandily in the first partial surface 21 a in an installationspace-optimized manner. In the installed state, the top of the strippersocket 30 forms a common plane or surface plane with the top of thesecond partial surface 21 b.

As can also be seen from FIGS. 2 and 3, the stripper socket 30 has ahead plate 32 formed with a collar 31, which is formed on one side (sidepointing to the right in the plane of the drawing) with a linearlyextending side edge surface 34 which abuts in a form-fitting manneragainst a corresponding side edge surface at the stripper plate 20. Saidcorresponding side edge surface on the stripper plate 20 is implementedby step 21.

Overall, the stripper unit 1 has an optimized shape and thus anoptimized installation space. For this purpose, the stripper plate 20has a part-circular cross section (section TQ) in the area of the firstpartial surface 21 a, which merges at the end of the part-circular crosssection to a linear course (LV) and this linear course preferablyextends symmetrically to the cylinder extension axis almost up to thestep 21, in each case.

The stripper socket 30 has a head plate 32 formed with a collar 31,which (in addition to the aforementioned side edge contact surface 34)is formed with a part-circular side edge surface which is flush with theside surface TQ of the stripper plate 20.

In the area of the second partial surface 21 a, the stripper plate 20has a symmetrical cross section which is bounded on one side edge by thestep 21 and by two part-circular sections 26, which are interconnectedby a linear intermediate area 27, which is clearly visible in the viewof FIG. 4.

Next, it can be seen from the figures that the pressure plate 10 and thestripper plate 20 in the installed state each have a flush centeringopening 19, 29, into which a guide pin 50 is inserted, wherein the guidepin has a thread at its one end-face, which protrudes from the lowerplane of the pressure plate 10.

Within this specification, embodiments have been described in a waywhich enables a clear and concise specification to be written, but it isintended and will be appreciated that embodiments may be variouslycombined or separated without parting from the invention. For example,it will be appreciated that all preferred features described herein areapplicable to all aspects of the invention described herein.

The implementation of the invention is not limited to the preferredexemplary embodiments specified above. Rather, a number of variants areconceivable which make use of the solution shown even in the case offundamentally different embodiments. Thus, it will be appreciated thatthe invention is susceptible to modification, variation and changewithout departing from the proper scope and fair meaning of theaccompanying claims.

1. A stripper unit, comprising: an unround cylindrical pressure plate,wherein the outer contour of the unround cylinder shape in a crosssection transversely through the pressure plate defines the installationspace thereof transversely to the direction of extent of the cylinder,and a stripper plate, placed on the end face of the pressure plate andmounted on spring elements such that it can be moved up and down withrespect to the pressure plate, wherein the stripper plate is formedgeometrically in such a way that it fits completely flush within theouter contour of the cylinder shape of the pressure plate and does notprotrude beyond it.
 2. The stripper unit according to claim 1,characterized in that further a punch retaining plate is provided, onwhich the stripper unit is installed, and the stripper plate and thepunch retaining plate are geometrically arranged to each other andformed in such a way, that the stripper plate in the installed statefits completely flush within the outer contour of the cylinder shape ofthe punch retaining plate and does not protrude beyond it.
 3. Thestripper unit according to claim 1, characterized in that the stripperplate has the same cross section as the pressure plate.
 4. The stripperunit according to claim 1, characterized in that the stripper plate hasa cylindrical recess (A) into which a stripper socket is inserted. 5.The stripper unit according to claim 4, characterized in that thestripper plate at an end face forms a stepped end face thereby dividingthe end face by a step separated into two partial surfaces which are indifferent planes.
 6. The stripper unit according to claim 4,characterized in that the recess (A) is arranged in the first partialsurface opposite to which the second partial surface protrudes in thedirection of extent of the cylinder.
 7. The stripper unit according toclaim 6, characterized in that the top of the stripper socket is in acommon plane together with the top of the second partial surface, or isset back relative to the plane defined by the second partial surface. 8.The stripper unit according to claim 4, characterized in that thestripper socket has a head plate formed with a collar, which head plateis formed on one side with a linearly extending side edge surface whichabuts against a corresponding side edge surface on the stripper plate.9. The stripper unit according to claim 8, characterized in that thecorresponding side edge surface is formed on the stripper plate by thestep.
 10. The stripper unit according to claim 1, characterized in thatthe stripper plate has a part-circular cross section in the area of thefirst partial surface, which cross section merges at the end of thepart-circular cross section to a linear course and this linear coursepreferably extends symmetrically to the cylinder extension axis almostup to the step, in each case.
 11. The stripper unit according to claim1, characterized in that the stripper plate has a part-circular crosssection in the area of the second partial surface, has the same crosssection as the pressure plate.
 12. The stripper unit according to claim4, characterized in that the stripper socket has a head plate formedwith a collar, which head plate is formed with a part-circular side edgesurface which is flush against the side surface of the stripper plate oris set back relative to the same.
 13. The stripper unit according toclaim 5, characterized in that the stripper plate has a symmetricalcross section in the area of the second partial surface, which crosssection is bounded on one side edge by the step and bounded by twopart-circular sections, which are interconnected by a linearintermediate area.
 14. The stripper unit according to claim 1,characterized in that the pressure plate and the stripper plate in theinstalled state each have a flush centering opening into which a guidepin is inserted, wherein the guide pin preferably has a thread at itsone end face, which protrudes from the lower plane of the pressureplate.
 15. The stripper unit according to claim 2, characterized in thatthe stripper plate has the same cross section as the pressure plate. 16.The stripper unit according to claim 3, characterized in that thestripper plate has a cylindrical recess (A) into which a stripper socketis inserted.
 17. The stripper unit according to claim 5, characterizedin that the recess (A) is arranged in the first partial surface oppositeto which the second partial surface protrudes in the direction of extentof the cylinder.
 18. The stripper unit according to claim 7,characterized in that the stripper socket has a head plate formed with acollar, which head plate is formed on one side with a linearly extendingside edge surface, which abuts against a corresponding side edge surfaceon the stripper plate.
 19. The stripper unit according to claim 5,characterized in that the stripper plate has a part-circular crosssection in the area of the first partial surface, which cross sectionmerges at the end of the part-circular cross section to a linear courseand this linear course preferably extends symmetrically to the cylinderextension axis almost up to the step, in each case; wherein the stripperplate has a part-circular cross section in the area of the secondpartial surface, has the same cross section as the pressure plate. 20.The stripper unit according to claim 10, characterized in that thestripper plate has a symmetrical cross section in the area of the secondpartial surface, which cross section is bounded on one side edge by thestep and bounded by two part-circular sections, which are interconnectedby a linear intermediate area; wherein the pressure plate and thestripper plate in the installed state each have a flush centeringopening into which a guide pin is inserted, wherein the guide pinpreferably has a thread at its one end face, which protrudes from thelower plane of the pressure plate.